一、图象编码的正交变换图像信息中有大量的多余度,人们力图寻找到一种方法,在编码过程中,设法将多余度尽量压缩到最小,而又使当图像重现时,能有一定的质量指标。在1968年首先应用信号的付里哀分析法,继而有图像的二维付氏变换的传输和编码概念;但是付氏变换需要复数的快速计算。不久,哈达姆变换代替了付氏变换,因其具 First, the orthogonal transformation of image coding There is a lot of redundancy in image information, people try to find a way, in the encoding process, try to minimize the redundancy as much as possible, but also when the image is reproduced, Have some quality indicators. In 1968, the signal’s Fourier analysis was applied first, followed by the concept of transmission and coding of the two-dimensional Fourier transform of the image; however, the Fourier transformation required a complex number of fast calculations. Soon, Hadam transformation instead of Fu transformation, because of its